Art of Problem Solving: Ratio Problem Solving

Art of Problem Solving's Richard Rusczyk solves some challenging ratio problems.

[krashkolster]

I always love when an instructor gets into it and makes a simple word problem so much fun!

[timberfan]

I don't understand how you determined how many quarters each person gives.

[elifeanor]

It's pretty easy because you can just (based on the question contents) set up (an) equation(s) by using (a) variable(s), like x.

[joarmape]

I don't understand how did you get 1/4 for jermy, 5/4 for shanon ans 9/4 for lisa ???

[zydee]

1 brownie has 4 quarters thersfore 15 brownies x 4( people not three )equals 60 quarters so to divide the brownies equally u divide by 4 people and you get 15 quarters for each persons(there are 4 persons sharing the amount ) not three. as for the other part well jeremy brought 4 brownies and that equals 16 quarters 4x 4/shannon brought 5 x4 = 20 and lisa brought 6 x 4 equal 24 /now since they all get 15 quarters u minus it from the amount of quarters they each brought that is how you get 1/4, 5/4/9/4 / i hope this explains it for all interested

[mcdarrylatacador]

joarmape  4x4 = 16 - 15 = 1 brownies for jeremy 
 5x4 = 20 - 15 = 5 Brownies for shanon 
6x4 = 24 -15 = 9 brownies for lisa. 

[emmagracecooks]

ain't no way I would do all that math for 0.40 ( for that matter I wouldn't do that for 3.60 cents! )! loved the video though!

[constantineq]

In a real life situation, I would throw 2 bucks at each person and be done with it